A fan coal mill with adjustable outlet ventilation volume

Abstract

The utility model discloses a fan coal mill with adjustable outlet ventilation volume, comprising a raw coal hopper, the raw coal hopper is connected with a mixing box and the coal mill through a coal delivery channel, the coal mill is connected with a separator, and also comprises an air volume regulating mechanism, comprising a fan-shaped damper arranged between the separator and the coal mill, the fan-shaped damper comprises a damper cavity shell, a fixed blade is fixedly arranged in the damper cavity shell, a movable blade is rotatably connected to the fixed blade through a bearing, an end of the movable blade away from the fixed blade is fixedly connected with an angle gear, and the angle gear is rotatably connected to a motor through a rotating shaft; when processing raw coal with smaller moisture and smaller particles, the motor drives the rotating shaft to rotate, the rotating shaft drives the angle gear to rotate, and then drives the movable blade to rotate on the fixed blade around the bearing, during the rotation of the movable blade, part of the airflow will be blocked from rising, thereby reducing the air volume, and reducing the flying of dust, thereby maintaining the cleanliness and safety of the working environment, and then ensuring the coal grinding efficiency.

Description

Technical Field

[0001] The utility model relates to the field of coal mills, in particular to a fan coal mill with adjustable outlet ventilation volume. Background Art

[0002] Coal mill is a machine that breaks coal blocks and grinds them into coal powder. It is an important auxiliary equipment of coal powder furnace. The coal grinding process is the process of coal being broken and its surface area increasing continuously. Although the existing fan coal mill has the ability to complete several processes such as drying, conveying, combustion and primary air supply at one time, in actual application, due to the inability to effectively adjust the outlet ventilation volume, when the coal mill processes coals with different humidity and particle sizes, such as raw coal with smaller humidity and particles, it often causes coal powder to fly in the air to form dust, affecting the working environment. When the dust concentration is high, there will even be safety hazards, thereby affecting the coal grinding efficiency. Therefore, it is necessary to improve it. Utility Model Content

[0003] In order to solve the above problems, the utility model provides a fan coal mill with adjustable outlet ventilation volume to solve the problems existing in the above background technology.

[0004] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0005] A fan coal mill with adjustable outlet ventilation volume comprises a raw coal hopper, which is connected to a mixing box and a coal mill through a coal delivery channel, a separator is connected to the coal mill, the coal mill comprises a fan mill casing and a fan mill striking wheel, the coal mill is driven by a driving device, an air duct is connected to the mixing box and the coal delivery channel, the fan coal mill with adjustable outlet ventilation volume also comprises an air volume regulating mechanism, the air volume regulating mechanism comprises a fan-shaped damper arranged between the separator and the coal mill, the fan damper comprises an damper cavity shell, a fixed blade is fixedly arranged in the damper cavity shell, a movable blade is rotatably connected to the fixed blade via a bearing, an end of the movable blade away from the fixed blade is fixedly connected to an angle gear, and the angle gear is rotatably connected to a motor via a rotating shaft.

[0006] Furthermore, a downwardly inclined flow guide device is provided in the coal conveying channel.

[0007] Furthermore, the air volume adjustment mechanism also includes a circular air door arranged on the air duct.

[0008] Furthermore, the fixed blades and movable blades are provided in multiple groups.

[0009] The beneficial effect of the utility model is that by arranging the air volume regulating mechanism, when processing raw coal with lower humidity and smaller particles, the motor drives the rotating shaft to rotate, the rotating shaft drives the rotating angle gear to rotate, and then drives the movable blades to rotate around the bearing on the fixed blades. During the rotation of the movable blades, part of the air flow will be blocked from rising, thereby reducing the air volume, which can reduce the flying of dust, thereby keeping the working environment clean and safe, and thus ensuring the coal grinding efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0011] Figure 2 This is a schematic diagram of the structure of the fan-shaped air door of the utility model;

[0012] Figure 3 It is a structural schematic diagram of the movable blade of the utility model;

[0013] Figure 4 It is a structural schematic diagram of a circular air door of the utility model;

[0014] In the figure: 1. raw coal hopper; 2. mixing box; 3. air duct; 4. coal delivery channel; 5. guide device; 6. fan mill housing; 7. fan mill striking wheel; 8. driving mechanism; 9. separator; 10. air volume adjustment structure; 101 circular air door; 102. fan-shaped air door; 1021. air door chamber housing; 1022. fixed blades; 1023. movable blades; 1024. rotating shaft; 1025. motor; 1026. angle gear. DETAILED DESCRIPTION

[0015] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. The embodiments described below with reference to the drawings are exemplary and are only used to explain the utility model, and cannot be understood as limiting the utility model.

[0016] A fan coal mill with adjustable outlet ventilation volume, such as Figure 1-4As shown, it includes a raw coal hopper 1, which is connected to a mixing box 2 and a coal mill through a coal delivery channel 4. A separator 9 is connected to the coal mill. The coal mill includes a fan mill housing 6 and a fan mill striking wheel 7. The coal mill is driven by a driving device 8. An air duct 3 is connected to the mixing box 2 and the coal delivery channel 4. The fan coal mill with adjustable outlet ventilation volume also includes an air volume regulating mechanism 10. The air volume regulating mechanism 10 includes a fan-shaped damper 102 arranged between the separator 9 and the coal mill. The fan-shaped damper 102 includes a damper cavity shell 1021. A fixed blade 1022 is fixedly arranged in the damper cavity shell 1021. A movable blade 1023 is rotatably connected to the fixed blade 1022 through a bearing. The movable blade 1023 is away from the fixed blade 1022. One end of the gear 1026 is fixedly connected to the corner gear 1026, and the corner gear 1026 is rotatably connected to the motor 1025 through the shaft 1024; in the initial state, the movable blade 1023 is located above the fixed blade 1022 and overlaps with it, and the fan mill impact wheel 7 crushes and grinds the raw coal, and sends the coal powder to the separator 9 through the airflow. When processing raw coal with smaller moisture and particles, the motor 1025 is started, and the motor 1025 drives the shaft 1024 to rotate, and the shaft 1024 drives the corner gear 1026 to rotate, thereby driving the movable blade 1023 to rotate on the fixed blade 1022 around the bearing. During the rotation of the movable blade 1023, part of the airflow will be blocked from rising, thereby reducing the air output, which can reduce the flying of dust, thereby keeping the working environment clean and safe, and thus ensuring the coal grinding efficiency.

[0017] In the utility model, preferably, the coal delivery channel 4 is provided with a downwardly inclined guide device 5, which helps the coal blocks to smoothly enter the coal mill for grinding, thereby improving the coal grinding efficiency.

[0018] In the utility model, preferably, the air volume regulating mechanism 10 also includes a circular air door 101 arranged on the air duct 3. In the initial state, the air door opening of the circular air door 101 is adjusted to the maximum. When processing raw coal with smaller humidity and particles, the air door opening is adjusted to a smaller degree as needed to make the bypass air for pre-drying in the mixing box 2 and the inlet air entering the coal mill through the coal delivery channel 4 uniform and appropriate, and can also reduce the air output and avoid wasting energy.

[0019] In the present invention, preferably, the fixed blades 1022 and the movable blades 1023 are provided in multiple groups, so that the air output can be more uniform.

[0020] The working principle of the utility model is as follows: in the initial state, the movable blade 1023 is located above the fixed blade 1022 and overlaps with it, the fan mill impact wheel 7 crushes and grinds the raw coal, and the coal powder is sent to the separator 9 through the airflow. When processing raw coal with smaller moisture and particles, the motor 1025 is started, the motor 1025 drives the rotating shaft 1024 to rotate, the rotating shaft 1024 drives the angle gear 1026 to rotate, and then drives the movable blade 1023 to rotate around the bearing on the fixed blade 1022. During the rotation of the movable blade 1023, part of the airflow will be blocked from rising, thereby reducing the air output, which can reduce the flying of dust, thereby keeping the working environment clean and safe, and thus ensuring the coal grinding efficiency. At the same time, a circular air door 101 is also provided on the air duct 3. In the initial state, the air door opening of the circular air door 101 is adjusted to the maximum. When processing raw coal with smaller moisture and particles, the air door opening is adjusted to a smaller degree as needed to make the bypass air for pre-drying in the mixing box 2 and the inlet air entering the coal mill through the coal delivery channel 4 uniform and appropriate, which can also reduce the air output and avoid wasting energy.

[0021] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A fan coal mill with adjustable outlet ventilation volume, comprising a raw coal hopper (1), the raw coal hopper (1) being connected to a mixing box (2) and connected to a coal mill through a coal delivery channel (4), the coal mill being connected to a separator (9), the coal mill comprising a fan mill housing (6) and a fan mill striking wheel (7), the coal mill being driven by a driving device (8), the mixing box (2) and the coal delivery channel (4) being connected to an air duct (3), characterized in that: The fan coal mill with adjustable outlet ventilation volume further comprises an air volume regulating mechanism (10), the air volume regulating mechanism (10) comprising a fan-shaped damper (102) arranged between the separator (9) and the coal mill, the fan-shaped damper (102) comprising a damper cavity shell (1021), a fixed blade (1022) being fixedly arranged in the damper cavity shell (1021), a movable blade (1023) being rotatably connected to the fixed blade (1022) via a bearing, an end of the movable blade (1023) away from the fixed blade (1022) being fixedly connected to an angle gear (1026), and the angle gear (1026) being rotatably connected to a motor (1025) via a rotating shaft (1024).

2. The fan coal mill with adjustable outlet ventilation volume according to claim 1, characterized in that: The coal conveying channel (4) is provided with a downwardly inclined flow guide device (5).

3. The fan coal mill with adjustable outlet ventilation volume according to claim 2, characterized in that: The air volume adjustment mechanism (10) further comprises a circular air door (101) arranged on the air duct (3).

4. The fan coal mill with adjustable outlet ventilation volume according to any one of claims 1 to 3, characterized in that: The fixed blades (1022) and the movable blades (1023) are provided in multiple groups.

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